The data at time of run was .27 crop ET, based on your soil moisture at start of day you went into deficit. Note there can be very slight differences in forecasts for the day, versus observations that we persist a day or two later. That is why it ran.
Now if you are also changing zone characteristics, those will affect historical data since we generate everything dynamically (for better or for worse) based on current zone characteristics.
"Watering because we should based on the soil moisture deficit and because we are allowed to based on FlexScheduleRules. WaterEntry=WaterEntry(date=2016-05-31T14:00:00.000Z, evapotranspiration=0.37, cropEvapotranspiration=0.27, irrigationEvents=, effectiveRain=0.0, soilMoistureLevelAtStartOfDay=0.25, temperatureMin=75, temperatureMax=98, depletion=0.31, stationId=null, exposure=1.0, cropCoefficient=0.73, depthOfWater=0.96)